John 4:2

St. Chrysostom thinks that this baptism, given by the disciples of Christ, did not at all differ from the baptism of St. John the Baptist; both, in his opinion, being used to prepare the people for Christ; but Alcuin interprets it otherwise. Some will ask, says he, whether the Holy Ghost was given by this baptism, since it is said the Holy Ghost was not yet given because Jesus was not yet glorified? To this we answer: that the Holy Ghost was given, though not in that manifest manner as after the ascension; for as Christ, as man, had always the Holy Ghost residing within him, and yet after his baptism received the Holy Ghost, coming upon him in a visible manner, in the shape of a dove; so before the manifest and public descent of the Holy Ghost, all the saints were his hidden temples. (St. Thomas Aquinas)

II. That he baptized those whom he made disciples, admitted them by washing them with water; not himself, but by the ministry of his disciples, v. 2. 1. Because he would put a difference between his baptism and that of John, who baptized all himself; for he baptized as a servant, Christ as a master. 2. He would apply himself more to preaching work, which was the more excellent, 1 Cor 1 17. 3. He would put honour upon his disciples, by empowering and employing them to do it; and so train them up to further services. 4. If he had baptized some himself, they would have been apt to value themselves upon that, and despise others, which he would prevent, as Paul, 1 Cor 1 13, 14. 5. He would reserve himself for the honour of baptizing with the Holy Ghost, Acts 1 5. 6. He would teach us that the efficacy of the sacraments depends not on any virtue in the hand that administers them, as also that what is done by his ministers, according to his direction, he owns as done by himself.

Verses 1-3 Jesus applied himself more to preaching, which was the more ( 1 Corinthians. 1:17 ) his disciples, by employing them to baptize. He teaches us that the benefit of sacraments depends not on the hand that administers them.